diff --git a/src/mesa/state_tracker/st_pbo_compute.c b/src/mesa/state_tracker/st_pbo_compute.c
index b114a546d6a..6c148f85291 100644
--- a/src/mesa/state_tracker/st_pbo_compute.c
+++ b/src/mesa/state_tracker/st_pbo_compute.c
@@ -931,6 +931,7 @@ download_texture_compute(struct st_context *st,
                .ir.nir = spec->nir,
             };
             cs = spec->cs = st_create_nir_shader(st, &state);
+            spec->nir = NULL;
          }
          cb.buffer_size = 2 * sizeof(uint32_t);
       } else if (!st->force_compute_based_texture_transfer && screen->driver_thread_add_job) {
@@ -986,6 +987,7 @@ download_texture_compute(struct st_context *st,
             .ir.nir = spec->nir,
          };
          cs = spec->cs = st_create_nir_shader(st, &state);
+         spec->nir = NULL;
          cb.buffer_size = 2 * sizeof(uint32_t);
       } else {
          nir_shader *nir = create_conversion_shader(st, view_target, num_components);